Robert, I have two cultivars that fall in this category. 'Just Call Me' has purple brackets. Not as distinctive as OS but still always there. 'Echo Location' has purple brackets and sets pods with a distinct purple coloring.
<<TBs with purple bracts below their flowers>>
Will look for pictures, but I'm not sure I have any.
KY Zone 6
From: Robert Pries <email@example.com>
To: iris-photos <firstname.lastname@example.org>
Sent: Fri, Nov 12, 2010 7:43 am
Subject: [iris-photos] Help with name and photo
Its bad to have poor recall but I trust the collective memory of this group can help me. I remember seeing TBs with purple bracts below their flowers but cannot remember the cultivar names. Does anyone know about these and have photos I could use in the Iris Encyclopedia? I know the species I. purpureobracteata has this character but I am looking for the TB hybrids that developed this independent of that species. Can anyone help?